Control Transformers, what exactly are they?

by | Sep 27, 2022

Control Transformers

A control transformer is a step-down transformer that reduces the voltage to power up the control of a circuit or machine. They provide safer conditions for technicians by allowing them to work in a low voltage environment instead of a high voltage one.

image to display control transformer with mounting base

Equipment used at homes such as residential heating, ventilating and air conditioning systems, and other machines use reduced voltage to feed the controls circuits, thermostats, solid state and electromechanical relays, and contactors.

Other known applications Control Transformers can be found in are aircraft, nautical and medical settings; induction heating as well as melting equipment, mining machinery and power sources.

Control transformers make it possible to transmit a constant current and manage extremely high voltage peaks reducing the risk of electroshocks. Their ability in the distribution of electricity is an additional benefit that if utilized in high current environment, results in increased effectiveness and security for the technicians and ultimately end users.

image to display step-down transformer diagram

Another benefit of control transformers is that inrush currents can be managed to be reduced to safe and harmless levels, thus prolonging the life expectancy of the equipment.

At Z-Tronix, we offer a wide variety of standard control transformers. You can choose from control transformers designed to operate under 120, 240, 277, 480 Vac or a combination of these voltages at the input side and delivering from 5 to 36 Vac at the output side. These also are offered with or without center tap at the secondary side and with a boost tap at the primary side. For a complete list of our standard control transformers please contact Z-Tronix’s Magnetic Component Engineer at or call us directly at 562-808-0800.